Chaeles f



(No Model.)

. 0. F. MORSE.

EXPANSION PULLEY.

No. 352,062. Patented NW2, 1886.

- UNITED H STATES PATENT 'OFFICEQ CHARLES r. Mon's'n, on RA DO PASSIGNOB or ONE-HALE TO JOSEPH n. DENISON, OF wnsr RANDOLPH, VERMONT.

EXPANSlON-PULLEY Pncrr'rA'rroiv forming partof Letters Patent No.352,062; dated. November 2, 1886.

Application filed February 9, 1886. Serial No. 191,304. (No model.) v iings.

' My invention relates'to that class of machinepulleys in which thediameter of the pulley can be'readily varied at will, without affectingits stability or strength, for the purpose of increasing or decreasingits circumference or flat face, thereby more perfectly adapting itto thelength of the belting used as well as to the speed of its revolution,and the objectsof my inventionare, first, to obviate the necessity ofusing belting of different lengths and the changing of the length of asingle belt to meet the demand required, and, second, to enable the op-.

erator to vary exactly the speed of the pulley,

as the change in its circumference may be little or great, according tothe object desired to be accomplished. These objects I attain byconstructing the rim of the pulley of metal,

consisting of an elastic coil, preferably made of steel, and supportedupon shoes on the ex-' tremities ofthe several spokes, the rim beingprevented from slipping on the shoes by means of friction-rollers whichintervenebetween'the upper surface of the shoes and the spring-coil orrim. The spokes of the pulley are jointed,

the two parts beingrigidly connectedtogether by right and left screws,by turning which the lengths of the spokes are susceptible of suchvariation as may be desired, and thereby cause the length orcircumference of the .rim or flat face of the pulley to be increased ordiminished. In the drawings, in which similar letters indicate likeparts, Figure 1 is a side elevation, partly in section, of a pulleyembodying my invention. Fig. 2 is a plan view of the same.

A is the rim or external face of the pulley. It is composed of a coil ofsteel,which is made to pass several times over the shoesB B,which arerigidly secured to the outer extremities of the jointed spokes C G,the'other ends of whichwhen the coil is in place between the lips orprojecting sides I) bof the shoes, the width of the flat face of, thepulley thusformed will be practically the same throughout. In one ormore of the spaces at d, between the arc of the rim A and the central orflat portion of the shoes above the ends of the spokes O C, is placedtransversely a friction-roller, E, which effectually holds the rim inplace, and prevents its slipping on the shoes as soon as it becomestightly crowded between the rim and the end of the shoe B, upon whichthe rimA rests.

The spokes O O of the pulley are jointed at or near their centers, andthe two parts e f are rigidly connected by right and left screws F F insuch a manner that, according as these screws are turned,the length ofthe spokes O C are increased or decreased to the extent desired, and thedistance of the several shoes B B from the 'hub D being thuscorrespondingly varied the length or circumference of the coiled springor flat face of the pulley isincreased or diminished, as the elasticityof the, spring compels it to press tightly upon the shoes, thusmaintaining its stability and strength,whatever may be the diameterobtained. As this operation can be easily performed at any time when thepulley is at rest, it is evident that-the pulley may be T readilyadapted to the length of the belting, and exactly according to thecircumference required for the speed desired.

All changes in the diameter of the pulley can be easily madewithout thenecessity of removing the pulley from the shafting or changing thebelting.

The lipsjor sides I) b of the several shoesB B are designed to be of thesame height as the thickness of the rim or flat face A of the'pul ley,and they may be so extended as to form a continuous outside guard to therim. They may also be arranged with adjustable setscrews through theirsides, to more rigidly hold the adjoining portions of the coil together,if so desired, without departing from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent,isv 1. An expansion-pulley composed of a rim consisting of a metalliccoil supported upon shoes attached to the extremities of jointed spokesprojecting from the hub, the two parts of the spokes being rigidlyconnected by right and left screws in coupling-boxes, by means of whichthe length of the spokes and the circumference of the pulley arecorrespondingly va- 5 ried, substantially as shown, and for the purposedescribed.

2. In an expansion-pulley, the rim A, consisting of a coil of steelhaving tapering ends, in combination with the shoes B B, frictionrollerE, jointed spokes O 0, whose length can be varied by right and leftscrewsin their coupling-boxes, and the hub D, substantially as and forthe purpose set forth.

3. In combination with the coiled rim A of I 5 an expansion-pulley, theshoes B B, having sides b b, the spokes, hub, and friction-rollerE,substantially as shown and described.

4. In an expansion-pulley, the hub D and rim, in combination with thejointed spokesC O, rigidly held by coupling-boxes provided 20 with rightand left screws, and the shoes B B, attached to their extremities havingsides I) b, and set-screws, substantially as described, and for thepurpose set forth.

In testimony whereof I do afiix my signature 2 5 in presence oftwowitnesses.

CHARLES F. MORSE. Witnesses:

J. D. DENIsoN, R. T. DUBoIs.

